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3.9 v8 rebuild

Discussion in 'It's A V8 Mate!!' started by beebe, Dec 12, 2009.

  1. beebe

    beebe New Member

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    Hello,
    I recently bought a non running '95 discovery, v8 automatic for cheap. It had the engine partially disassembled, due to it having an overheating problem. So I took it out and stripped it down to the block. Two pistons had small chunks missing. I took the block to a machine shop, and they honed the cylinders and he called me back and said 4 of the cylinders are oval.

    So I found some +20 thou oversize pistons on ebay, from RPI Engineering. He's going to bore out the cylinders.

    These are the pistons Land Rover V8 3.9 Pistons Kit Car Morgan MG TVR Marcos - eBay (item 190357560029 end time Dec-17-09 01:22:53 PST)

    Was this the right thing to do? Are those liners thick enough to accommodate a rebore? Especially since these pistons have a higher compression ratio than the standard ones?

    Cheers,
    Roger

    P.S. Here is the Discovery http://g5i.net/pictures/engineout.jpg
     
  2. GasFiredDisco

    GasFiredDisco New Member

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    Hi Rodger,

    The discovery's V8 is a rover V8, and them parts are designed for a rover V8, and RPI are a reputable company that specialize in rover V8 parts (and bespoke builds) so yes it was the right thing to do - the liners are easy thick enough - and - it gets the disco back on the road with a nice reconditioned engine - that you can proudly say that you re-built to people.

    Them pistons aren't doing anything to the compression, as the 3.9 in the discovery is the 174bhp high compression engine, i.e. 9.35 : 1 compression ratio.
     
  3. Beast o Bodmin

    Beast o Bodmin Banned

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    never did like the welsh.....tom jones is also cra
    when its finished do not use it for more thyan 20kmiles.it will die.sell it .
     
  4. beebe

    beebe New Member

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    Why do you say that? You think it will drop a liner? Because of the rebore? or because it has overheated? or ?

    Thanks,
    Roger
     
  5. Beast o Bodmin

    Beast o Bodmin Banned

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    never did like the welsh.....tom jones is also cra
    the 3.9 is strong in most cases.its just wot v8 rovers do,wack a merc v8 init if ya like it that much.
     
  6. fett

    fett Well-Known Member

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    BMW one is better , the 4.0 not the 4.4
     
  7. beebe

    beebe New Member

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    Seems you've done one or two more posts on the forum than me, so I probably should be listening to you, but I'm still confused. An engine, which has done 160k can be rebuilt but then can't be relied upon for anything further than about 20k?

    I thought rebuilt engines were often better than new engines because the block is seasoned. You're less likely to get warped heads etc. because stuff has warped as much as it's going to and then has been machined back to within tolerance.
     
  8. fett

    fett Well-Known Member

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    Yes but rover v8's arnt like normal engines, they are ****e!:D

    I know, I got one:doh:
     
  9. Beast o Bodmin

    Beast o Bodmin Banned

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    never did like the welsh.....tom jones is also cra
    not true but yes fett.

    I do have a good one.A 4.0 with carbs on.tis sweet.It has done 180k miles on LPG after being rebuilt and is still good.

    most engines are ****e.some are exellent but middle ground is rare.UIF you have a good one it will live long if not you will be very broke and drinking ethanol...
     
  10. fett

    fett Well-Known Member

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    BMW V8's must always be good ones then:D
     
  11. Beast o Bodmin

    Beast o Bodmin Banned

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    never did like the welsh.....tom jones is also cra
    no,
    IMO the V8 for the morgan +8 by ptp hinkley is faultless.When on twin sus its fookin luverly....;);)
     
  12. Sean

    Sean Banned

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    and that comment is based on what ?

    experience ?

    google ?

    your overly active imagination ?
     
  13. Beast o Bodmin

    Beast o Bodmin Banned

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    never did like the welsh.....tom jones is also cra
    use of 3.5 and above mentioned..

    the 3.5 can be ok and live long but the ptp injun is real lusty and spins up nice and sweet 5000+with some power left...:D
     
  14. Sean

    Sean Banned

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    so how long have you owned one for ?
     
  15. Beast o Bodmin

    Beast o Bodmin Banned

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    never did like the welsh.....tom jones is also cra
    done 2 years on +8 engine and had 3.5 before that 3 years or more and others 3.9 standard.......